Pendulum-support for lenses.



G. DALEN. PBNDULUM SUPPORT FOR LENSES.

APPLICATION PILED MAY 3, 1910.

Patented Feb. 28, 1911.

INVENTOR ATTORNEY FIG. 5.

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GUSTAF DALEN, OF STOCKHOLM, SWEDEN, ASSIGNOR 'IO AMERICAN GASACCUMULATOR COMPANY, OF PHILADELPHIA, PENNSYLVANIA,'A CORPORATION OF NEW JERSEY.

PENDULUM-SUPPORT FOR LENSES.

Specification of Letters Patent.

Patented Feb. 28, 1911.

Application filed May 3, 1910. Serial No. 559,218.

To all whom it may concern:

Be it known that I, Gus'rar DALfiN, a subject of the King of Sweden, residing--in Stockholm, Sweden, have invented certain 5 new and useful Improvements in Pendulum- .0 than the lens and its supporting means for supporting the load of the upper counter weight which is employed in connection with such lenses.

In the carrying out of my invention I have provided a construction in which the upper 'counter-weightis carried and supported by arms which are separate from .the lens and its supporting or frame members; The said arms are so secured to the "lens carrying shaft or to a. part connected to such shaft that the lens and its supporting members are not subjected to the load of the counter-weight.

In the accompanying drawings, I have illustrated a convenient embodiment of my invention, but it is to be understood that changes in. the details of construction and arrangement of the parts may be varied without departing from the scope of my invention as the same is set forth in the specification and claims which follow.

In the drawings:-Figure 1 is a longi tudinal sectional elevation of a construction 4 for supporting the lens 5. At its lower end the shaft 2 is provided with a weight 6. For supporting the upper counter-weight 7 there are provided arms 8 which are separated from the lens and its supporting or frame. members 9 and are connected directly to the lens support 4. The arms 8, as will be seen, are arranged outside of the lens 5 and its framemembcrs 9. It is evident that as constructed the counter-weight 7 exerts no pressure whatever on the lens or the frame members 9. By this construction the inconvenience resulting from the arrangement which heretofore generzdl" has been employed, in which the counterweight 7 rests directly on the upper edge of the lens 5 and its frame members 9, is entirely avoided.

.-In constructions as heretofore employed in which the counter-weight has posted directly upon the lens and its frame members 9, it has been necessary to use very thick or Wide frame members'in order to obviate damage to the lens. The use of such thick .or wide members has caused wide shadows which, as is well known, are very objectionable. In the improved construction the arms 8 transmit the load of the counter-Weight 7 to the shaft 2 through the support 3 in dependently of the lens 5 and the frame members 9 and, therefore, may be located at any point desired with respect to the said lens 5 or the frame members 9. For the purpose of obviating shadows from the members 8 they are placed preferably, as illustrated in Fig. 2, radially with respect to the members 9 of the lens frame. It is also to be noted that the arms S'are rectangular in cross section, being thin in the direction in which the light rays extend or radiate from a light inside of the lens structure.

I have shown no light inside of the lens structure but it is to. be understood that any form of light may be employed.

Having thus described my invention, I claim:-- r

1. -A pendulum lens structure comprising a pivotally supported pendulum shaft, alens supported upon the said shaft, a counterfor supporting the said counter-weight, the.

said arms being located radially with respect to the members of the lens support- I ing frame. V

3. In a device of the character described, the combination of a pendulum shaft having a universal joint connection with a supporting member, a lens supported upon thesaid shaft, frame DIGIIlbQl'S for securing the said lens in position, a counter-Weight, arms having connection With the said shaft for supporting the said counter-Weight, the said arms being located outside of the said lensand outslde of the stud frame members fol" securing the lens in position and being in radial alinement with the said frame mem- 10 

